rust cause

New England car with about 200k miles. Seller is asking 10k but my hunch is that it's too high. How's the rust level? Any other red flags? Thank you all-- this community is awesome!

I recently pulled my factory roof rack for inspecting and rust treatment and believe that I may have found a leading reason why the factory rack mounting points often rust out so badly. It looks like water flows in from above and then gets trapped inside the rack feet. See what look like water...